Perhaps you should try some spelling variations:
"planner's guide to teaching" » "planter's guide to teaching", "player's guide to teaching", "pleader's guide to teaching"
"planner guided to teaching" » "laser guided to teaching"
"planar guides to teaching" » "planar grid to teaching", "planar waveguides to teaching"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("planar guides to teaching") OR ((("planner guided to teaching") OR ("planner's guide to teaching")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"planar guides to teaching\") or (((\"planner guided to teaching\") OR (\"planner's guide to teaching\"))))".
• Removing quotes may allow a broader search: (( planar guides to teaching ) or ((( planner guided to teaching ) OR ( planner's guide to teaching )))).
• Adding a wildcard symbol may retrieve word variants: (("planar guides to teaching") or ((("planner guided to teaching") OR ("planner's guide to teaching"))))*.